Readability Checker — Flesch Reading Ease and Grade Level

This free readability checker scores your writing using the Flesch Reading Ease formula — the most widely used readability test in English — and shows your US grade level alongside word count, sentence count, and average words per sentence. Paste any text into the box above and the score updates instantly as you type. Use it to check the reading level of a draft before publishing, simplify dense copy, or verify that your content is genuinely accessible to the audience you are writing for.

At Arb Digital, readability is part of our content production checklist for every client page we write. The Flesch score gives us an objective signal when a draft needs simplifying — something experienced editors catch instinctively, but that this readability checker quantifies in seconds for anyone.

What Is the Flesch Reading Ease Score?

The Flesch Reading Ease test — developed by Rudolf Flesch and validated across decades of research — measures how easy a piece of English text is to read. As the Flesch–Kincaid readability tests explainer describes, the formula calculates a score from 0 to 100 based on two factors: average sentence length and average syllables per word. Higher scores mean easier reading; lower scores mean more complex text.

Here is how this readability checker interprets the score ranges:

• 90–100 — Very easy. Understood by the average 11-year-old. Suitable for general consumer content.
• 70–89 — Easy to fairly easy. Conversational and accessible to most adults.
• 60–69 — Standard. Comfortable for most teenagers and adults. The target for most web content.
• 30–59 — Fairly difficult to difficult. Suited to college-educated readers.
• 0–29 — Very difficult. Suited to specialists and academics.

For most general web content, a score of 60 or above is the goal. This benchmark keeps your writing welcoming to the broadest possible audience without oversimplifying your ideas.

Reading Level Checker — Understanding Grade Level

Alongside the Flesch score, this reading level checker shows the approximate US grade level your text requires, calculated with the Flesch–Kincaid Grade Level formula. A grade level of 8 means roughly an eighth-grade education (around 13–14 years old) is needed to read the text comfortably. Counter-intuitively, a lower grade level is almost always better for general content — even highly educated readers prefer and absorb clear, simple writing faster.

This is the same calculation used by Microsoft Word's readability statistics and by professional editing tools. According to the US Federal Plain Language Guidelines — the government standard for public-facing communication — most documents aimed at a general audience should target an 8th-grade reading level or below. Major publishers, including most newspapers and consumer magazines, deliberately write at this level or lower.

How This Readability Checker Calculates Your Score

The Flesch Reading Ease formula applied by this tool is:

Score = 206.835 − (1.015 × average words per sentence) − (84.6 × average syllables per word)

The tool counts words by matching letter-and-number groups, counts sentences by detecting sentence-ending punctuation, and estimates syllables using a vowel-cluster algorithm. This produces accurate results for standard English prose — the same approach used by academic and professional readability tools. The accompanying grade level uses the Flesch–Kincaid Grade Level formula: Grade = (0.39 × average words per sentence) + (11.8 × average syllables per word) − 15.59.

Readability Score vs Grammarly and Yoast

Grammarly's readability score is one of the most-searched benchmarks because Grammarly is so widely used. Its readability feature uses the Flesch–Kincaid formula — the same formula this tool uses — so the scores are directly comparable. Yoast SEO's Flesch Reading Ease feature works the same way, flagging content that scores below the "good" threshold inside WordPress.

The practical difference is context: those tools bundle readability inside a wider grammar, style, or SEO workflow, while this free readability checker is a standalone tool you can use with any text from any source. Many writers use it to assess content drafted elsewhere, review already-published pages, or benchmark a competitor's copy against their own.

Readability and SEO — The Real Connection

Google does not use Flesch scores as a direct ranking signal, but readability affects SEO meaningfully through user behaviour. Nielsen Norman Group's landmark research on how users read on the web found that people scan rather than read most content — and clear, well-structured writing with short sentences dramatically improves how much of a page is actually consumed. Longer time on page, lower bounce rates, and deeper engagement all signal quality to search algorithms.

Google's Helpful Content guidance emphasises writing for people, not search engines — and content written for people is almost always more readable. Use this checker to review published pages, not just drafts: improving the readability of an existing page often lifts its engagement metrics without any other change.

Practical Ways to Improve Your Readability Score

• Shorten sentences. Aim for an average of 15–20 words. Split long sentences at natural break points — "and", "but", "because".
• Choose simpler words. Prefer "use" over "utilise", "help" over "facilitate", "show" over "demonstrate". Plain words communicate faster.
• Use active voice. "We tested the tool" reads cleaner than "The tool was tested by us." Active constructions almost always score better.
• Remove filler. Cut "very", "really", "in order to", "it should be noted that" — they add syllables and length with no meaning.
• Break up paragraphs. Shorter paragraphs reduce reader fatigue even though paragraph length is not in the Flesch formula.
• Read aloud. Any sentence you stumble over is a candidate for simplification. The ear catches what the eye misses.

Common Ways to Use This Tool

• Pre-publish check on every blog post or landing page to confirm it lands in the 60–75 range for a general audience.
• Simplify technical copy by pasting a draft, spotting the grade level, and rewriting until it drops.
• Audit existing pages that underperform on engagement to see whether difficulty is the hidden cause.
• Benchmark competitors by pasting their copy to see how readable the top-ranking pages actually are.

Related Free Tools From Arb Digital

Readability is one half of great content; the other is on-page SEO. Pair this checker with our keyword density checker to confirm your keywords are present without stuffing, our word counter for length and structure, and our slug generator to build a clean URL. Browse everything at our free tools hub, or see the full picture on our content marketing and copywriting pages.

Frequently Asked Questions